//===-- Value.cpp - Implement the Value class -----------------------------===//
//
-// This file implements the Value class.
+// This file implements the Value and User classes.
//
//===----------------------------------------------------------------------===//
-#include "llvm/ValueHolderImpl.h"
#include "llvm/InstrTypes.h"
#include "llvm/SymbolTable.h"
-#include "llvm/SymTabValue.h"
-#include "llvm/ConstantPool.h"
-#include "llvm/ConstPoolVals.h"
-#include "llvm/Type.h"
-#ifndef NDEBUG // Only in -g mode...
-#include "llvm/Assembly/Writer.h"
-#endif
+#include "llvm/DerivedTypes.h"
+#include "llvm/Constant.h"
+#include "Support/LeakDetector.h"
#include <algorithm>
//===----------------------------------------------------------------------===//
// Value Class
//===----------------------------------------------------------------------===//
-Value::Value(const Type *ty, ValueTy vty, const string &name = "") : Name(name){
- Ty = ty;
+static inline const Type *checkType(const Type *Ty) {
+ assert(Ty && "Value defined with a null type: Error!");
+ return Ty;
+}
+
+Value::Value(const Type *ty, ValueTy vty, const std::string &name)
+ : Name(name), Ty(checkType(ty), this) {
VTy = vty;
}
// a <badref>
//
if (Uses.begin() != Uses.end()) {
+ std::cerr << "While deleting: " << Ty << "%" << Name << "\n";
for (use_const_iterator I = Uses.begin(); I != Uses.end(); ++I)
- cerr << "Use still stuck around after Def is destroyed:" << *I << endl;
+ std::cerr << "Use still stuck around after Def is destroyed:"
+ << **I << "\n";
}
#endif
assert(Uses.begin() == Uses.end());
+
+ // There should be no uses of this object anymore, remove it.
+ LeakDetector::removeGarbageObject(this);
}
-void Value::replaceAllUsesWith(Value *D) {
- assert(D && "Value::replaceAllUsesWith(<null>) is invalid!");
- while (!Uses.empty()) {
- User *Use = Uses.front();
-#ifndef NDEBUG
- unsigned NumUses = Uses.size();
-#endif
- Use->replaceUsesOfWith(this, D);
-#ifndef NDEBUG // only in -g mode...
- if (Uses.size() == NumUses)
- cerr << "Use: " << Use << "replace with: " << D;
-#endif
- assert(Uses.size() != NumUses && "Didn't remove definition!");
- }
-}
-void Value::killUse(User *i) {
- if (i == 0) return;
- use_iterator I = find(Uses.begin(), Uses.end(), i);
- assert(I != Uses.end() && "Use not in uses list!!");
- Uses.erase(I);
+void Value::replaceAllUsesWith(Value *New) {
+ assert(New && "Value::replaceAllUsesWith(<null>) is invalid!");
+ assert(New != this && "this->replaceAllUsesWith(this) is NOT valid!");
+ assert(New->getType() == getType() &&
+ "replaceAllUses of value with new value of different type!");
+ while (!Uses.empty()) {
+ User *Use = Uses.back();
+ // Must handle Constants specially, we cannot call replaceUsesOfWith on a
+ // constant!
+ if (Constant *C = dyn_cast<Constant>(Use)) {
+ C->replaceUsesOfWithOnConstant(this, New);
+ } else {
+ Use->replaceUsesOfWith(this, New);
+ }
+ }
}
-User *Value::use_remove(use_iterator &I) {
- assert(I != Uses.end() && "Trying to remove the end of the use list!!!");
- User *i = *I;
- I = Uses.erase(I);
- return i;
+// refineAbstractType - This function is implemented because we use
+// potentially abstract types, and these types may be resolved to more
+// concrete types after we are constructed. For the value class, we simply
+// change Ty to point to the right type. :)
+//
+void Value::refineAbstractType(const DerivedType *OldTy, const Type *NewTy) {
+ assert(Ty.get() == OldTy && "Can't refine anything but my type!");
+ if (OldTy == NewTy && !OldTy->isAbstract())
+ Ty.removeUserFromConcrete();
+ Ty = NewTy;
}
+void Value::killUse(User *U) {
+ if (U == 0) return;
+ unsigned i;
+
+ // Scan backwards through the uses list looking for the user. We do this
+ // because vectors like to be accessed on the end. This is incredibly
+ // important from a performance perspective.
+ for (i = Uses.size()-1; Uses[i] != U; --i)
+ /* empty */;
+
+ assert(i < Uses.size() && "Use not in uses list!!");
+ Uses[i] = Uses.back();
+ Uses.pop_back();
+}
//===----------------------------------------------------------------------===//
// User Class
//===----------------------------------------------------------------------===//
-User::User(const Type *Ty, ValueTy vty, const string &name)
+User::User(const Type *Ty, ValueTy vty, const std::string &name)
: Value(Ty, vty, name) {
}
void User::replaceUsesOfWith(Value *From, Value *To) {
if (From == To) return; // Duh what?
- for (unsigned OpNum = 0; Value *D = getOperand(OpNum); ++OpNum) {
- if (D == From) { // Okay, this operand is pointing to our fake def.
+ assert(!isa<Constant>(this) &&
+ "Cannot call User::replaceUsesofWith on a constant!");
+
+ for (unsigned i = 0, E = getNumOperands(); i != E; ++i)
+ if (getOperand(i) == From) { // Is This operand is pointing to oldval?
// The side effects of this setOperand call include linking to
// "To", adding "this" to the uses list of To, and
// most importantly, removing "this" from the use list of "From".
- setOperand(OpNum, To); // Fix it now...
+ setOperand(i, To); // Fix it now...
}
- }
-}
-
-
-//===----------------------------------------------------------------------===//
-// SymTabValue Class
-//===----------------------------------------------------------------------===//
-
-// Instantiate Templates - This ugliness is the price we have to pay
-// for having a ValueHolderImpl.h file seperate from ValueHolder.h! :(
-//
-template class ValueHolder<ConstPoolVal, SymTabValue>;
-
-SymTabValue::SymTabValue(const Type *Ty, ValueTy dty, const string &name = "")
- : Value(Ty, dty, name), ConstPool(this) {
- ParentSymTab = SymTab = 0;
-}
-
-
-SymTabValue::~SymTabValue() {
- ConstPool.dropAllReferences();
- ConstPool.delete_all();
- ConstPool.setParent(0);
-
- delete SymTab;
-}
-
-void SymTabValue::setParentSymTab(SymbolTable *ST) {
- ParentSymTab = ST;
- if (SymTab)
- SymTab->setParentSymTab(ST);
-}
-
-SymbolTable *SymTabValue::getSymbolTableSure() {
- if (!SymTab) SymTab = new SymbolTable(ParentSymTab);
- return SymTab;
-}
-
-// hasSymbolTable() - Returns true if there is a symbol table allocated to
-// this object AND if there is at least one name in it!
-//
-bool SymTabValue::hasSymbolTable() const {
- if (!SymTab) return false;
-
- for (SymbolTable::const_iterator I = SymTab->begin();
- I != SymTab->end(); ++I) {
- if (I->second.begin() != I->second.end())
- return true; // Found nonempty type plane!
- }
-
- return false;
}
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